Important Notes:
These are actual results generated using actual 4K Netflix test content. The clips were chosen to produce the most easily perceived differences.
ZPEG typically boosts compression efficiency by 30% on 4K content.
These are actual results generated using actual 4K Netflix test content. The clips were chosen to produce the most easily perceived differences.
ZPEG typically boosts compression efficiency by 30% on 4K content.
Finally, all video sequences were reduced in resolution for easy playback to HD quality (1080p). This makes the artifacts somewhat less visible, but the videos are easily payable on a standard PC platform.
The HD resolution videos are transcoded to a higher bandwidth (CRF 23) so as to not confuse the issue with additional artifacts. The original videos, their renderings and the FFmpeg command scripts are available in 4K 8-bit y4m format on request.